book Maths Puzzle Numerical Ability

Write problem in terms of simpler logarithmic forms

log b v^7/ u^8

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book Other Question

THE GRAZING GOAT

Zoe the goat is tied by a rope to one corner of a 15 meter by 25 meter barn in the middle of a large, grassy field. Over what area of the field can Zoe graze if 7. The sum of two numbers is 17 and the sum of their square is 145. Find the larger number.
a. 10 b. 11 c. 8 d. 9 e. none
The answer is D, but how? Please help me prepare for my